Fluid-pressure turbine



H. L. GUY.

FLUID PRESSURE TURBINE- APPLICATION man MAYIIJ, m9.

1,360,936. Y Patented.Nov.30,1920.

/ S INVENTOR %%MZZW .UNETED STATES PATENT OFFICE.

HENRY LEWIS GUY, OF MANCHESTER, ENGLAND, ASSIGNOR TO THE BRITISH WEST-INGHOUSE ELECTRIC AND MANUFACTURING COMPANY LIMITED, A COMPANY OF GREATBRITAIN.

FLUID-PRESSURE TURBINE.

Application filed May 13, 1919.

To all whom it may concern:

Be it known that I, HENRY LEWIS GUY, a subject of the King of GreatBritain, and a resident of Victoria Park, Manchester, in the county ofLancaster, England, have invented a new and useful Improvement inFluid-Pressure Turbines, of which the following is a specification.

This invention relates to steam turbines of the kind in whichthe movingblades are attached to the periphery of one or more disks or wheelsmounted on or formed integral with the turbine shaft. In order toprevent a dii'ference of pressure existing between the two sides of suchdisk or wheel while the turbine is in operation a hole or holes(hereinafter termed balance holes) .are usually provided in the disk. Adisk of this kind is subject to considerable stress and the provision ofbalance holes therein results in a concentration of stress in thevicinity of said holes which may amount to as much as two or three timesthe average stress in a disk not provided with balance holes andconsiderably reduces its factor of safety.

The present invention has for its object to provide. an improvedconstruction in which concentration of stress in the disk or wheelarising from balance holes therein is obviated, and according theretothe balance holes are formed in the blading attached to the disk insteadof in the disk or wheel itself.

In the accompanying drawings Figure 1 is a fragmentary front view andFig. l .a sectional view of a turbine disk or wheel with blades attachedthereto, as at present constructed, with the balance holes in the disk.Fig. 2 is a fragmentary front view of a portion of a turbine disk orwheel with binding attached thereto, and-Fig. 2 a sectional view of thesame showing balance holes formed in the blading in accordance ith thepresent invention. Figs. 3, 3 i, 4, 5 and 5 are similar views to Figs. 2and 2" respectively, showingmodified constructions in accordance withthe invention. Fig.

6 is a sectional plan view -of the blading shown in Figs. 2 and 3, andFigs. 7 of the blading shown in Figs. 4 and 5.

Specification of Letters Patent.

Patented Nov. 30, 1920.

Serial No. 296,810.

In Figs. 1 and 1 the turbine disk or wheel is indicated at 8, the blades9 being attached to the disk or wheel 8 by rivets 10 in a well knownmanner. The balance holes 11 are, as shown. formed in the disk itselfresulting in undesirable concentration of stresses as before mentioned.

Referring now to Figs. 2 and 2, the roots 12 of the blades 9 areincreased in length so as to project beyond the periphery of the disk 8,and the balance holes 13 are formed in said projecting roots either bydrilling or in any other suitable manner. p

The construction shown in'Figs. 3 and is similar to that shown in Figs.2 and 2 exceptthat the roots 12 of the blades do not project so farbeyond the periphery of the disk 8 the balance holes 13 eing locatedcloser to the edge of the disk as shown.

In Figs. 4c and 4c the balance holes 13 are formed by grooves cut aroundthe rear face of the blade roots 12. The formation of the balance holes13 is similar in Figs. 5 and 5. the only difference in this constructionbeing the method of attaching the blades 9 to the disk or wheel. Whereseparate packing pieces are employed between the blades thl balanceholes may be formed in the packing pieces which are extended so as topro j ect beyond the periphery of the disk.

It is to be understood that the invention is not limited to anyparticular manner of forming the balance holes in the binding. theconstructions hereinabove described be ing given by way of example only.

I claim as my invention i 1. A steam turbine disk or wheel havin'bal'ance holes formed in the blading attache. to the periphery thereofwith the objec specified.

2. A steam turbine disk structure including a web portion with a bladefastening portion and blading having fastening means cooperative withsaid fastening portion. said structure having balance holes thereinoutside of the web portion.

In testimony whereof I have hereunto subscribed my name this 10th day ofMarch. 1919.

